The patch implements replacements for copysign, log1p (taken from Mark's
patch #1381) asinh, acosh, atanh (taken from uclibc's libm). I modified
the a*h functions for our needs. They set an errno and use our macros.
The patch also adds the three hyberbolic arc functions to the math
module. Math related code is now in Include/pymath.h and Python/pymath.c.
copysign is now defined on Windows, too.
I also found a bug in configure.in (my fault). The C99 function is
called finite(), not isfinite().
Christian